LEAP 15 Unable to login to text terminals: System does not let me enter password

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For an unknown reason the local login on my text terminals (login, pam) got screwed up somehow so that I cannot login to those terminals any longer (while I have no problems using KDE Konsole):

After having entered the username (any user and root) the password request appears but without any delay first a new password request is shown on the next line immediately followed by 'Login incorrect'.

I have no idea what is going on here. I appears as if the delay for accepting the password is set to zero. However, I have no idea how that coudl happen and could also not figure out how this might possibly be repaired.

Re: Unable to login to text terminals: System does not let me enter password

Need a better description,
- Is this a text-only machine without an installed Desktop?
- Did you login successfully with an ordinary User account and then you switched to a terminal window or is this initial login?
- If this is somehow from a graphical Desktop, this is a real tty? or a windowed console?
- I can't remember seeing DOMAIN_NAME recently in a shell, is your machine a member of a network security domain like AD?

Re: Unable to login to text terminals: System does not let me enter password

Hi TSU,

Thanks a lot for your response!

- This is a standard openSUSE Leap 15.0 installation on a personal computer with the KDE as the main working environment

- Auto-login is active: So, after booting I get automatically logged into KDE as an ordinary user which works perfectly okay

- Windowed console: The KDE program 'Konsole' (with standard settings) providing a virtual console works as usual and opens up with the ordinary user logged in. There, I can also apply 'sudo' and 'su' without problems

- The term 'DOMAIN_NAME' which I have used above is not the real output that I see but a placeholder for the actual computer name (like 'USER-NAME').

- The problem that i have appears as soon as I switch from KDE on tty7 to any of the other terminals using Strg-Alt-F1 (through F6). It is on these terminals that I am unable to enter the password as described resulting in failed logins rendering those terminals completely inaccessible to me

2- Kernel version 4.12.14-lp150.12.22-default
-> Tested on a friend's openSUSE machine: Everything works fine (which is in accordance with juando's report in akarako's thread).

3- Kernel version 4.12.14-lp150.12.25-default:
-> This is the kernel version for which akarako reported his login problem: The password can be entered but will somehow not be accepted and the login process gets timed out.
-> I get exactly the same issue with that kernel!

4- Kernel version 4.12.14-lp150.12.28-default
-> This is my current kernel version that produces my current problem which is different to akarako's problem: Here, the password cannot be entered, as described further above, and for that reason the login fails.